Sometimes when you get the drip off the oil pan's little skid plate, it can be coming from the welds that hold that little skid plate on. This one:

I fixed this once with JB weld inside the pan.. With the pan off I could pull on the skid plate, and see where the metal was cracked.. of course now that I know what I know I'd most likely get it welded for real, but at the time JB seemed to fit the skill set, and budget. a repair that's still kickin', to my knowledge. so if you take the pan off, check it out.